Worktable



z- ,1926. I J. L. PERKINS Er AL WORKTABLE Original Filed Feb. 15, 1922 4 Sheets-She t 2 M 4, 1NVENT0R8.

' "ATTORNEY.

Aug- 24 1926. 1,597,244

J. L. PERKINS ET AL WORKTA BLE Original Filed 13. 1922 4 Sheets-Sheet 5 'INVENTORJ'.

" ATTORNEY.

' Aug. 24 19 26. 1,597,244

- .1. PERKINS ET AL WORKIIABLE Original Filed 15. 1922 4 Sheets-Sheet t,

Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE,

JULIAN L. PERKINS, OF WEST SPRINGFIELD, AN JOHN oAKLEY, ROBERT A. WILSON, AND HIRAM n. CROFT, or SPRINGFIELD; rmssaozrnsnrrs, AssIGNoRs T0 PERKI S APPLIANCE COMPANY, OF SERINGFIELID, MASSACHUSETTS,

MASSACHUSETTS.

A CORPORATION OF WORKTABLE.

g0rigina1 application filed February 13, 1922, Serial No. 536,160, Patent No. 1,456,604. Divided and this application filed July 9,

Our invention relates to improvementsin work tables, and consists generally of a pair or plurality of work holders mounted on a turn-table whereby said work holders can be located alternately in and out of operative position, the same having an orbital path around a common center, means and mechanism for securing the work on and to said holders, removable supporting means for the top of the work holder which is in operative position, and locking and releasing, and operating means for said turn-table, together with such other parts and members as may be necessary or desirable in order to render the work table complete and serviceable in every respect, all as'hereinafter set forth.

This work table is especially adapted for a vertical broaching machine, such as that which forms the subject of our application for Letters Patent No. 1,486,604 of the United States, filed February 13, 1922, Serial No. 536,160, of which application the present application is a divisional part, although said work table is not limited to machines of that type.

One object of our invention is to produce a work table which is capable of having mounted thereon and secured thereto stacks of blanks for ring gearsior the like, and for supporting and carrying such blanks while the same are being out.

A further object is to provide a work table of this character wherewith one set of blanks can be placed in. position and made ready for cutting or broaching while another set of blanks is being c'utor broached, the loading and unloading operations being performed by the operator.

Another object is to provide for such work table means whereby the same can be conveniently, practically, and efiiciently controlled and operated by the hand and foot.

Still another object is to furnish locking devices for the movable parts ofor associated with the work table, to the end that i1n proper movements at improper times are preventethand said table is rendered safe and reliable as well as highly eflicient.

Other objects and advantages will appear in the course of the following description.

A preferred embodiment of the invention,

1923. Serial No. 650,405. 1

whereby we attainthe objects and secure the advantagesof the same,isillustrated in the accompanying drawings, and we will proceed to describe the invention with reference to said drawings, although it is to be understood that the form, construction, arrangement, etc., of the parts in various aspects are not material,1and may be modified without departure from the spirit of theinvention. I

In the drawings, in, which similar reference characters designate similar parts throughout the several views, Figure lis a top plan of a work table which embodies our invention as aforesaid, showing the same applied to a broachingmachine; Fig. 2, an enlarged, top plan of the bearing disk carried by the yoke; 3, an enlarged, horizontal section through said machine and work table, takenon lines 3--3, in Fig. 6; it, a side or what may be termed front elevation of said machine and work table,

with portions of the frame broken out to disclose interior elements; Fig. 5, an end elevation of said machine and work table; Fig. 6, an enlarged, vertical section through the machine and work table, with top and bottom portions omitted, such section being approximately in the vertical, longitudinal center or work plane. of the machine; Fig. 7, an enlarged, top plan of the manuallyoperated and pedally-operated lever mechanism of the work table; Fig. 8, an enlarged, bottom plan of a portion of the base of the frame of the machine, showing the pivots and their hearing lugs for certain of the elements in the! aforesaid mechanism, together with the rock-shaft lock member of such mechanism; Fig. 9, a back side elevation of saidmechanism as shown in 7, and, Fig. 10, an enlarged detail of said lock member.

The cutting or work plane hereinbefore referred to is on lines :c--m in Fig. 1.

The machine illustrated in the aforesaid application is a double or duplei: machine throughout, and the mechanism on either side of the transverse center of said machine forms a complete unit. In the present case we have shown one of such units, the same being the right-hand unit.

It will be desirable, not to say necessary,

' 4. The uprights 2 extend below the floor 'line into a receptacle 5 for'waste oil and chips, the frame also comprises bearing and other parts --of which particular 'mention will be made as or when necessary.

f For the sake of convenience in describing the machine and work table, the side illustrated in 'F ig.' 4 will be considered as "the front and the opposite side as the rear.

The machine is provided with a vertical broach carrier 6 arranged to slide up down and contact with the outer edgesof the uprights 2. On the inside of thecarrier 6 in the transverse center thereof is a rack 7 with which a gear 8 intermeshes. The gear Sis driven by a gear 9. Journaled inthe uprights 2 and in suitable bearings with which said uprights are provided, one above theother in the orc er named, horizontal-shafts 10, 11, and 12. Secured on the forward terminal of the shaft 10 is a main driving gear 13. Secured on the rear terminal of the shaft 10 is a pinion 14, and such pinion intermeshes with a gear 15 secured on the rear terminal of the shaft 11. The gears 9 and 8 are respectively secured to. the shafts 11 and 12. Thus means are provided for reciprocating the rack 7 and the carrier 6. V

A broach holder 16 is mounted to oscillate on its vertical axis in the carrier 6. Secured within the holder 16 in different radial planes thereof are pluralities of roughing and finishing broaches 17 and 18,

respectively. The breaches 17 cut on their down stroke and the broaches 18 cut on their up stroke. Operatively either the roughing broaches or the finishing; breaches are in the work plane was, the holder 16 being oscillated between strokes. I

Journaled in the uprights 2 and projecting beyond the front side of the front upright are two horizontal rock-shafts 19-19Q The rock-shafts 19 .areprovided on their front terminals, which terminals extend beyond the front upright 2', with arms 20 and 21. The arm 20 extends downwardlyto the left from the upper rock-shaft 19, and the arm 21 extends downwardly to the right from the lower rock-shaft 19'. A connecting-rod 22 has each end pivotally attached at 23 to the arms 20 and 21, the upper terminal of said rod being connected with the free terminal of said first-named arm, and the lower terminal of said arm being connected with said second-named arm intermediate of its ends. The construction and arrangement of the parts are such that, if the connecting-rod 22 be raised, the arms 20 and 21 are swung upwardly in a manner to carry the. pivots 23 through corresponding arcs,

said arms rockingon and with the rock shafts 19. These parts and members together form a portion of the mechanism by means of which the breach carrier 16'is oscillated, and with which the present application is not concerned, but they also together constitute a portion of the work-table mechanism, as will subsequently be made clear.

The connecting-rod 22 is raised and lowered b means of a manuallv-o'oerated shown in Fig. 9. The inner terminal of and the lever 24,is forked as shown at 29, such terminal embracesthe connecting-rod 22 between two 30 thereon. Said is prm ided with a latch-rod 31, adapted'atits inner terminalto enter either of the openings 28 in the. sector 27. keeper 32 provided on the lever 24, adiacent to the sector 2'7, to serveas a guide for the latchrod 31. At the outer end of the lever 24 is a handle 33. The outer end of the latchrod 31 is connected with a latch 34 which is pivotally connected at 35 with the lever 24., adjacent to the handle 33. The latch 34 is extended outwardly alongside of the handle 33, and a spring 36 is interposed between the extended part of the latch and said handlepso that said part is normally held away from said handle, and the latch-rod 31 permitted to enter into and remain in locking engagement with the sector 27.

"When the inner end of the latch-rod 31 is in the upper opening 28, the connecting rod 22 is thereby locked in its low position. Before the connecting-rod 22 can be raised, it is necessary to grasp the handle 33 with the extended part of the latch 34, and force such part, against the resiliency of the spring 36, toward said handle, whereby said latch is rocked on the pivot 35 and the latch rod 31 drawn out of the upper opening 28. The lever 24 can now berocked oniits pivot 25 to raise the terminal'29 thereof and with it the connecting-rod 22. 'After thus elevating the connecting-rod 22, the latch 34 is released to its spring 36, and the latter acts to return said latch to normal-position and actuate the latclrrod 31 into the lower open ing 28. r The lever 24 is now locked in its new position, and with it the connecting rod 22 in elevated position. Upon again grasping the handle 33 and withdrawing the latch-rod 31 from the lower opening 28, and rocking" the lever 24 downwardly at the forked end, the connecting-rod 22 is lowered. The latch-rod 31 is then permitted to enter the upper opening 28 when the i parts and members are again locked.

A bell-canl: lever 37 is pivotally connected at 38 to the back side of'an intermediate wall of the base 1 below the horizontal plane of saidbase, Figs. 4, 7 and 9. A connecting-rod 39 has its upper terminal pivotally attached at 40 to the free end of the arm 21, and its lower'terininal pivotally attached at 40 tothe inner terminal of the bell-crank-lever 37. The bell-cranlr-lever 37 is arranged withits angleuppermost, and

the angular portion of the same is the part mounted on the pivot 38. There is a horizontal bearing 41 for the pivot 38, which. 1

bearing extends from the aforesaid inter mediate wall of the base, such wall being indicated by the numeral 42. A transverse rock-shaft 43 is journaled in bearings44 and '45 in the end portion of the base 1', as shown in Fig. 8. Secured to the outer terminal of the rock-shaft 48 is an upstanding arm 46, and a connecting-rod 4.? extends between said arm and the short armof the bell-cranklever 37, such bell-cranklever being arranged with its short arm extending toward the adjacent end of the base lend its long arm extending toward the central, transverse, vertical plane of said base. The connecting-rod 47 is approximately horizontal and has its ends pivoted at 48 48 to the arm 46 and the shortarm of the bell-cranklever 37, respectively. The rock-shaft hasan offset 49 therein, the transverse center of which is inthe work plane c0w of the machine. i

The rock-shaft 43 and its connections are so arranged that, when. the connectinga-otl 22 is in its depressed and normal position, the connectingrod 39 is also in its depressed position, and the oilset 49 is disposed verticallyp Upon elevating the connecting-rod 22 and, through the medium of the arm 21, the connecting-rod 39, the belI-crankJeVer 37 is actuated to'draw inwardly the connecting-rod 47, and thus partially to rotate the rock-shaft 43 in the direction to carry the offset 49 from the vertical into an approximately horizontal position. A reversal of'the movement of the connecting-rod 22 brings about a reverse movement of the intervening parts and membersbetween said rod and the rocleshaft 43, and actuates the latter in such a manner a to return the offset 4 to vertical position. Theoifset 49 serves as a lock for a pin 50 that will presently be described.

Associated with the connectingrod 47 and the rock-shaft 43, although not directly connected therewith, are an approximately horizontal treadle 51, and two approximately horizontal levers 52 and The treadle 51 is pivotally connected at 54, intermediate of its ends, with a pair of lugs 55with which the end portion of thebase l is provided-on the .inside; the lever 52 is pivotally connected at 56, intermediate of its ends, with a pair of lugs 57 with which said end portion is also provided on the inside; and the lever 53 has its inner end pivotally connected at with a pair of lugs 59 with which said end portion is further provided. The ti'eadle 531 extends, outwardly through a slot in the end the base, and is provided at its outer terminal with a foot-piece 60. The outer end-of thelever has an universalor ball-joint connection 61 with the inner end of the treadle 5i, and a similar connection 62 is provided between the outer end of the ever 3 and said treadle adjacent to the pivot 54 and between said pivot and said first-named connection. The inner terminal of the lever 521s forked, as shown at 63. The lever 53 is provided on top adjacent to the pivot with a disk or plate 64 which constitutes what may be termed a stirrup.

The treadle mechanism and the rockshaft 4-3 with its otlset49 are associated with avorlr-holding mechanism mounted on the base 1 above said first-named mechanism and said rock-shaft.

Therearo two supporting and carrying elements for the work, and provision is made for transposing the same so that either can be located in operative relation to the adjacent breach holder 16. e will now describe the aforesaid elements.

A normally-stationary turn-table 65 is mounted on the base 1. The turn-table has a cen ral, vertical shaft 66 which is joinrnaled directly above the stirrup 64, in a bsaring in the base 1, a ball-bearing 68 being interposed between said stirrup and the bottom of said shaft. The portion of the/shaft 66 that is in the bear .ing 6? is larger than the portion of said shaft upon which the turntable 65 is di rectly mounted, so that a shoulder 69. is formed on said shaft. table rests directly on top of the base 1, and shoulder 69 is then in the same plane 1 top. The axis of the shaft 66 is in the work plane of the machine. The turn-table may or may not be rigidly at tached to the shaft 66, just as is preferred. Rising from the turn-table 65, on opposite sides of the shaft 66, are two vertical shafts F0. Each. shaft 70 has a screwthi'eadcd base with which a nut 71 is conne red to anchor said base in the turn-table. lVithin the aforesaid base of each of the shafts 76 in the an al center thereof is an opening The opening 72 in either shaft is ad d to receive the upper terminal of pin When either shaft 70 is Normally the turn- 7 vertical said of the downwc v from the bottom of said pin and ilh the bottom oi? the r her 73,,

' iead 75 on the lower end of t e e spring 76 1s nterposed be s t e- 1min pas -g i the m er Egand nor l y actuates said pin upward.- ly d r ains it, in eiigagieiuent h the shaft 'ZO aho ve. The roclr shaft 43 is so lo cated that, whenits oii'setdt) is vertically disposed the s she is directly beneath the head 75 or the stem 7 so that said stern and the pin 50 can notvhe forced downwardlv 7 The torlt 63 of the lever 52 engages the stern Ti above the head 75. In G}. ler to rotate the turntable 65 bout its axis, for the purpose of changing the relative positions of the work-holders of which the shafts 7O constitute parts, or, in

7 other words, to interchange the positions of said shafts, it is first necessary'to unlock said turn-tahle by withdrawingthe pin 50 from the open ng 72 in the left-hand shaft 2 0, and then raise sa d turn-table with the work holders on the shoulder 59 from the base '1. These results are accomplished by grasping the handle of the lever 2% and actuat gsaid l ver to withdraw the offset 4 9 from beneath the head 75, and placing the foot on the part 60' of the treadle 51 and ac.-

tuating said-treadle to rock upwardly the connected terminals of the levers 52 and 53.

Since the connection 61 is farther from the pivot 5% than is the connection 62, and the fulcrum of the lever 52 is nearer said connection 61 than is the fulcrum of the lever the forliedterminals 63 of said lever 52 7 moves more quickly and through a greater space than'does the stirrup 54 which is on the leverh quite near to the inner fulcrun ed to inal of the seine, when the pore ,tion of said treadle with which said levers are connected is elevated. Consequently the first effect the depression of the outer terminal oi the treadle 51 is to rock the in such a manner as to carry the (:23 thereof downwardly and so With- J the pin 50 froin'engagement with the "'0 above, through the medium of the he ad possible because the offset 49 is now out And the-second effect 01 the motion imparted to the treadle is to raise the lever 68 and the stirrup 64L.

Glhe upward movement of the stirrup 64' is lidingly arranged in a hol- 1 th pin 50 and h 7 F and the stem 74:, and against the resiliency oi the spring 76, whlch action 1s the shaft 65., and the latter is elevated and with: it the turn-table 65 and all s and members supported there.-

rd movement of the shaft 66 it, :heieg only s table clear oi"- the of the base 1, ll ith the turn-table thus ed thesanie can be rotated onand with ;,t 66 on the hallbeari-ng 68. 7 the turn-table has been given by revolution, the treadle 51 is said illlf'l'l talfilfi settles down or vity onto the base 1, and the r forces the pin 50 upwardly into the open' in the base of the newly p-resentedshaft '?0, .The lever {this then carries n of the pa by, The ups comparative cient to raise-the tu A Lop! rated to restore the offset to its ups position beneath the "head 75.

Each shaft 70 is the axis otthe work holder mounted on such shaft, and such holt 7;: comprises, besides said shaft, 3; horizontal case Y7, a horizontal plate or disk 78 for; rertical ca n sleeve 79, sir: sen at, vertical spacers or separators 8G,the

s uunbr of v'ytical friction bars 81,41 ho jizontal 82, and s x, long vertical rods 83 and nuts 84- therefor, together with n; her parts and members yet to be described, illustrated more particularly t in 6. A ball-hearing 85 is'interposed between the turn-table 65 and the base 77, so that the latter nay revolve freely on the former, The can 'sleeve 79'has a wormivheel secured to toe base thereof, and said sleeve is shouldered at 8? to receive beneath the shoulder the edge of the opening in the plate provided for the passage oi that portion of the sleeve which is be tween said shoulder and the WOllll FllQQl S6. The worm-wheel 86 is received and operates in central opening 88 in the top of the base 77. Also in said opening is a worm 89 which inter neshes with the wornorwheel S5; The plate 87 rests on the base 77 above the wori '-wheel 86, and. the separators 81. rest at their lower ends on said plate. The head 82 is on top of the cam sleeve79 -d the separators 81. Each separator has two radial "ins 90, and one of the rods 83 is located between such arms, and there are top andbottoin,horizontal flanges or webs 9.2 and an intermediate, horizontal flange or web 93 which extend between and connect said arms, and through which said rod passes, The rods also pass through a flanged portion. of the cap 82 and the plate l8 o hetap'ped nto the base 77. The friction bars 81 are slidingly arranged, between the arms of adjacent separators 80, on the plate 78 and under the head 82. The work, consisting in this case of a plurality or multiplicity of ring gear blanks 9a, is passed over the head 82 and down around the arms 90 and bars 81, with the botionr most blank resting on a supporting ring 95 that is scarred to the periphery of the disk The blanks 9 1, after being piled or stacked one on top of the other around the arms 90 and bars 81, are aligned and formed into a holiow cylinder which is concentric with the work holder, and frictionally secured by means of the cam sleeve 79,

after which clamps 96, there being as many of such clamp'sas therearc rods 83, are placed in position for the further security of the stack of blanks.

The worm 89 is mounted on a shaft 97 that is journaled at both terminals in the base 77, and has at one end a squared head 98, Figs. 4: and 5, to receive a wrench (not shown). Upon revolving the worm 89, through the medium of the shaft 97, the worm wheel 86 is rotated and with it the cam sleeve 79. Formed on the periphery of the cam sleeve 79 are cams 99, Fig. 3, one such cam for each friction bar 81,v and said cams are so arranged on their sleeve that they actuate said bars outwardly when said sleeve is rotated to the left, and permit said bars to move inwardly when said sleeve is rotated in the opposite direction. The depth of the bars 81 is sutlicient to enable them to be forced hard against the blanks 94:, when said bars are actuated outwardly by the cams 99, and firmly to engage said blanks on the inside and hold them securely in place, at the same time exactly aligning the bars and disposing the same concentrically with the sleeve 79 and its shaft 70. The separators 80 are clear of the cams 99.

Each clamp 96 is an angular member adapted to bear with the bottom edge of its vertical part on the uppermost blank 9 k and with its horizontal part on the flange of the head 82, said horizontal part being slotted at 100 to accommodate one of the rods 83 below the upper end of the same. After the blanks 94 have been stacked to the retpiiredheight, or until approxin'iately level with the tops of the separators 80, the clamps 96 are slipped into place beneath the nuts 5% on the rods 83, with the depending parts of said clamps bearing on the top of the uppermost blank, and said nuts are screwed down tightly onto said clamps, thus forcing the latter hard against the blanks. Inasmuch as the rods 83 are screwed into the'base 77,when the nuts 84: are screwed down tightly, all of the members through which said rods pass are securely tied together. The binding force now exerted by the clamps 96 on the blanks 9%, added to the frictional engagement exist ing between the barsSl and said blanks, causes the latter to be so securely and rigidly held in place on their supporting members that any movement of any blank independent of the holder is rendered impossible. I y i The flange of the head 82 may be cut away, as shown at 101, to leave oppositelydisposed raised rims 102, Figs. 1, 3, and 6, upon which the inner ends of the clamps 96 bear. This construction insures the desired forcible contact of the clamps 96 with the stack of blanks 94 when the nuts 84 are tightened.

After the blanks 94: have been cut and formed into gears, they are released so that they can be removed from their holder, by loosening the nuts 84 and removing the clamps 96, and revolving the Worm 89 in the direction to rotate the worm-wheel 86 to the right. The rotation of the worm wheel 86 to the right, and the consequent rotation in the same direction of the camsleeve 79, removes the pressure from the inner edges of the bars 81 and loosens said bars sufiiciently to enable the completed gears to be lifted ofi of the holder.

The arms 90, which form guides for the friction bars 81, fall short of the blanks 94: when the latter are concentrically disposed, while the throw that may be imparted to said bars by the cams 99 is sufficient to project said bars beyond the inner circumfcra ence of said blanks,

After the blanks 94 have been placed in position on their holder and clamped thereon and thereto, it is necessary that the shaft of suchholder be supplied at the upper end with a bearingsupport, wherefore a horizontal, vertically-movable yoke 103 and horizontal disk 104: are provided. This disk 104 has an upwardly-extending sleeve 105, and both are bored to receive and lit over or around the upper terminal of the shaft 70. Thesleeve 105 is ,screw'threaded at the topto receive a nut 106. The disk 10 when in operative position rests on the head 82. The central portion of the hub of the yoke 103 is bored to receive the sleeve 105, and is embraced between the nut 106 above and a ballbearing 107 below, which latter is interposed between the disk 104: and

said hub. The disk 104 is, therefore, free to rotate beneath the hub of the yoke 103 and on and with the shaft 70. y

The shafts 70 are loosely journaled and thus able to rotate, and the parts and members mounted directly on said shafts are free thereon so that independent movement between them and the shafts is possible, but it is obvious that said shafts might be secured against rotation in" their bearings, or said parts and members might be secured to said shafts, since the required result-s in any case would be obtained.

The head 82 has two oppositely-disposed lugs 108, from which rise two posts or studs 109. Theprotruding portions of the studs 109 are tapered in part and end in screwthreaded terminals. at the top. Tapered openings, which appear at 110110 in Fig. 2, are provided in the disk 10 1 to receive the l minal against the corresponding face of the This lock- 7 weights 117 are attached to the other ter-' of said uprights.

1 down with the applic protruding portions of the studs 109.- Nuts 111,. Figs el and 5, are screwed onto the studs 109 above the disk 10%. It is now clear that rotary motion imported to the disk 10 1 anust be communicated to thehead 82 and rigidly attached parts and members, including the blanks 94. v V

Referring" more particularly to Figs. 3,

1,. and. 5, it w ill be'seen that forwardlyand rearwardly-extending .wings 112 are provided on oblique webs (one of which is the web 2.6) at the outer ends of the uprights 3, and that these wings, together with gins 113 .113 thatare bolted to the faces of said wings, afford vertical ways or guides for the inner terminals of the arms of the yoke 103,

such terminals being indicated at 11 111 l hill? 3, and there appearing also in this view vertical, ,V-shaped guides 115+11 5 that .it'and 'slide in corresponding grooves in said wings, such guides beingon the inner sidesof said terminals; r

"The yoke 103. iscounterweighted, Two cables 116. are attached at their lower terininals to the arms oftheyoke. and counterroinals of said cables, the latter passing over sheaves. 118 that are loosely mounted on horizontal studs 119-119 supported at the proper angles by bearings 1 0120 which project from the outer faces of the uprights 3 near the. top and adjacenttov the outer ends The counterweights 117 enable the yoke 103 to be moved up and ation of comparatively little power.

On the inner face of that portion of the w front yoke arm that slides between the front wing 112 and the front gib 113 a vertical rack 121 is providethanda short shaft is journaled in said wing;- and protrudes from the front edge thereof to receive a crank 123-see Fig- 3. A pinion 12a secured to the shaft 122, and said pinion intermesheswith the rack 121. The front wing 112 is recessed to receive the pinion 12st. The crank 123 is secured tethe aforesaid protruding terminal of the shaft 122. When the crank 123 is turned in one direction the yoke 103 is elevated, through the medium of the'shaft pinion 124s, and rack 121, and. when said crank is turned in the opposite direction said .yoke is lowered, through the same medium as before. I

In order to. lock the yoke 103 at any desired elevatiomcr secure the same against accidental descent,.alock-screw125. is tapped into the outer face of the front gib 113 and adapted to. bear Wltll. its inner teradjacent yoke terminal 114. screw is provided with, the usual handle. When the lock-screw 125 isv turned. inwardly to. bear forcibly; against the adjacent terminal 11a, it prevents the yoke froininoving' downwardly, but. upon loosening strew the yoke may be freely moved either direction. I V

The yoke 103 is let down onto the holder beneath, by means of the pinion 11 and rack 121, over the shaft 70 and'onto the head 82 of said holder, said shaft being received in the disk 10% and its sleeve 1.05..

The sleeve 105 is actually ahub of the'disk 10 1 for either shaft 70. At this time it may be necessary'partially to rotate the disk 10% so as to bring the openings 110 in said disk into line with the studs 109 below,. in order that, as the'yoke descends, said studs shall enter said openings and permit said disk to come to rest on top of the head 82. V The;

nuts 111 are'then screwed onto the studs 109 above the disk 104s, After the yoke has been lowered into operative position, it is secured by means of the lock-screw 125.

After the blanks 94 have been broached and converted into gears the nuts 111 are taken off the lock-screw 125 is loosened u a s o and the yoke 103 with the disk -10d-is raised clear of the holder, into a position such as that indicated by dotted linesin Fig. The;

turn-table 65 is then operated to move the aforesaid holder from beneath the yoke, and

the-gears are removed from the holder;

Although the yoke is part of the work holder, it is herein treated as adistinct or independent member, inasmuch as the'ot of the same is to center the upper terminal of the work-holder shaft being itself ren1ovable from and replaceahleon said holder. The yoke 103 supplements the lock-pin in preventing the turn-table .111. ro tating.

During the operation of the machine the work holder is intermittently rotated to in;

l the work.

dfhile the blanks on the inner work holder arebeingcut, a stack of blanks 1S placed] on the outer work holder, and secured means of the cam sleeve 79 and the ole. 96 and nuts 84 of said outer holder.

At the end of the gear-cutting operation Jeri armed on the first stack of blanl s,'t1e

Next the mitted to descend onto the base 1', and the yoke 103 is actuated downwardly onto: the

inner work holder and connected therewith through the me'dlnm: of the disk 10%,. studs 103 is elevated by means of the crank is operated to displace the offset j forcibly to engage said blanks.

at this time is the outermost holder, and the gears are taken from sa d holder.

The inner circumference of, the hollow blanks 94 is less than that of the supporting ring or flange 95, otherwise the friction bars 81 would encounter said flange and fail The required radial movement in the bars 81 is comparatively slight.

The carrier 6 is represented in its high position in Fig. 5, and in its low position I in Figs. 4 and 6, but this difference in positions is immaterial so far as the present invention is concerned.

Whatwe claim as our inveniton, and desire to secureby Letters Patent, is

1. In a work table, a support, a turntable above said support, means adapted to lock said turn-table to said support, work holders mounted on said turn-table, said work holders consisting in part of shafts, and a removable yoke adapted to be engaged with one of said shafts.

2. In a work table, a support, a turn-table above said support, a pin adapted to lock said turn-table to said support, work holders mounted on said turn-table, said work holders consisting; in part of shafts, and remov able supporting means for the top of one of said shafts.

in a work table, a support, a turn-table above said support, a pin adapted to lock said turn-table to said support, work holders mounted on said turn-table, said work holders consisting in part of shafts, and a removable yoke adapted to be engaged with one of said shafts.

The combination, in a work table, with a support provided with a bearing and a hollow lug, a shaft in said bearing, a turntable mountedon sa1d shaft and normally resting on said support, said shaft having a shouldered engagement with said turntable, work holders mounted on said turntable, and a lock pin in said lug and normally in engagement with said turntable, of a treadle, a pivotally-mounted lever pivotallv connected with said treadle, connectmeans between said pin and said lever,

anda second pivotally-mounted lever piv otallv connected with said treadle, said second lever having a part that forms a stirrup for said shaft, the construction and arrangement of parts being such that, when the free terminal of said treadle is depressed, said first lever withdraws said pin from locking engagement with said turn-table, and said second lever raises said shaft and elevates said turn-table with said work holders from saidsupport, whereby said turn-table is free to be rotated.

5. The combination, in a work table, with a support provided with a hearing and a hollow lug, a shaft journaled in said hearing, a turn-table mounted on said shaft and normally resting" on said support, said shaft having a shouldered connection with said turn-table, work holders, consisting in part of shafts, mounted on said turntable, and a lock pin in said lug, said pin being adapted to engage the axial center of either of said work-holder shafts, of a treadle, a pivotally-mounted lever pivotally connected with said treadle, connecting means between said pin and said lever, and a second pivotally-mounted lever pivotally connected with said treadle, said second lever having a part that forms a stirrup for said shaft, the construction and arrangement of parts being such that, when the free terminal of said treadle is depressed, said first lever withdraws said pin from looking engagement with said turn-table, and said second lever raises said shaft and elevates said turntable with said work holders from said support, wherebyisaid turn-table is free to be rotated.

6. The combination, in a work table, with a support providedwith a bearing and a hollow lug, a shaft journaled in said bean ing, a turn-table mounted on said shaft and normally resting on said support, said shaft having a shouldered engagement with said turn-table, work holders mountiid on said -turn-tahle,and a spring-pressed lock pin in said lug, said pin being adapted to engage said turn-table, and provided with a headed spindle, of-a treadle, a pivotally-mounted lever pivotally connected with said treadle, and having" a part adapted to engage said headed spindle, and a second pivotallymounted lever pivotally connected with said treadle, said second lever having a member that forms a stirrup beneath said shaft, the construction and arrangement of parts being such that, when the free end of said treadle is depressed, said first lever acts to withdraw said lock pin from engagement with said turn-table, and then said second lever acts to raise said shaft and elevate said turn-table from said support, so that the turn-table with its work-holders can be rotated.

7. The combination, in a work table, with a scupport, a turn-table mounted on and adapted to be rotated ZlbOllL said support, work holders mounted on said turn-table, and means to look said turn-table with either of said work holders in operative position, of removable supporting means for the top of the work holder which is in operative position.

8. The combination, in a worktable, with a support, a turn-table mounted on and adapt ed to be rotated above said support, and work holders mounted on said turn-table, said turn-table being adaptedto locate either of said work holders in operative position, of

3 tatedi around said sleeve. friction bars said cam sleeve. 2

li J ts arms sliding top of the work. holder which in operative position, and a rackand pinion with Whichone of said yoke arms and saidupright supporting member are provideo, whereby said yolre'is raised out of. and is lovrered into engaging position, when saic pinion is ro- 9.. In a Work. table, a Work holder comprisinga shaft, a base mounted on said shaft, a cam sleeve mounted on said shaft above said base, a: head mounted on said shaft above said sleev support the Work, mounted sa sleeve above said base, separatorsmounted on said plate around said sleeve, fricticn bars slidingly arranged: on said plate between said separators, and adapted to be forced outwardly by said cam sleeve, means to bind together said base, head, and separators, and means to rotate said cam sleeve,

10. In Worlt table, a whorl: l er comprising a shaft, a base mounted on said shaft, calm sleeve mounted on said shalt above said base, and provided with an act-o.- ating member, a suitably mounted actuating member for said first-i l ner ing member, a head mounted on said .i above saii sleeve, a plate, at eed to support the Work, mounted on said sleeve above said base, separators mounted on said plate around said sleeve, friction bars slidingly arranged on said plate between said separators, and adapted to be forced outwardly by said cam sleeve, and means to bind to gether said base, head, and separators.

11. In a worlr table, a Work holder comprising a shaft, a base mounted on said shaft, a cam sleeveinounted on said shaft above said base, head mounted on 7 sha ft above said sleeve, a plate, adapted to support the work, separators mounted on s d plate around said sleeve, means to re said separar "sin spaced relationship,

l d separators, andadapted to forced outwardly by said cam sleeve, and means to rotate said cam sleeve.

12. in a \v table, a Work holder com prising a shaft, a base mounted on said shaft, a cam sleeve mounted on said shaft above base, head mounted on said shaft port the \vorl-i, ounted l shdinp'ly "-rranged on said plate beta-*eei said separaand adapted to be forced outwardly by said cam. sleeve, means to bind together said. base, head, and separators, such means in cluding means for retaining" said separators in. spaced relationship, and means to rotate i ly connected with said supporting means, and adapted to engage the a plate, adapted to 13in a Work table, a Worl: holder comp lg a shaft, a base mounted one-aid shaft, a cam sleeve mounted on said shaft above said base, a plate, adapted to support a stack of hollow blanks, mounted on said sleeve above said base, separators mounted on said plate around said sleeve, friction h 's slidingly arranged on said plate be between said separators, and adapted to be forced"outwardlyby the cam sleeve, means to bind together saidbase, separators, head, such means inclucling mea.ns sin said separators in spaced relation,-

l also clamping means for the top of of blanks, and means to rotate prising a vertical shaft,. a cam sleeve mounted on said shaft, means to actuate said sleeve on said shaft, a plurality of frie tion bars engaging at their inner edges said sleeve, a plurality of separators for said bars, and means to retain said separators in place.

16. In a Work table, a Work-holder oomprising a vertical shaft, a cam sleeve mounted on said. shaft, and provided with r a serrated member, a serrated member intermeshing with said first-named serrated member' andv adapted to be operated by means of a crank to rotate said sleeve on said shaft, a-plurality offriction bars in engagement at their inner ends With said sleeve, a plurality of separators for said bars, and means to secure said separators in place. 7 I V i i 17. In a Work table, a Work holder com? prising a base, flanged inembersmounted.

on said base, a head mounted onsaid flanged. members, rods passing through the flanges on said members and engaging saidbase and head, nuts on said rods at the head ends,

and clamps adapted to be interposed between theparts of said head engaged by said rods 7 and said nuts on said rods, and to be forced, onto the top of a stack of blanks on said base, by said nuts when tightened. V Y v 18. The combination, in a Work table, with; a turntable, Work holders mounted on said turn-table, a lock-pin for said turn-table, 130

tween said separators, and adapted to be lever, pivotal connections between said lever and said rock-shaft, whereby the latter is operated to withdraw said part from looking position relative to said pin, and to restore such part to such position, and locking means for said lever.

19. The combination, in a work table, with a turn-table, work holders revolubly mounted on said turn-table, said holders consisting in part of shafts and heads, of a movable yoke carrying a member adapted to fit over either of said shafts, and means to attach said member to the head below.

20. The combination, in a work table, with a turn-table, and revoluble work holders mounted on said turn-table, said holders consisting in part of shafts and heads provided with studs, of a yoke carrying a member adapted to fit over either of said shafts, said member being perforated to receive the studs in the head below. a

21. In a work table, a work holder com-- prising a shaft, a base mounted on said shaft, a cam sleeve mounted on saidshaft above sa idbase, a member, adapted to sup port a stack of gear blanks, mounted on said sleeve above said base, separators mounted on said member around said sleeve, friction bars slidingly arranged on said plate between said separators. and adapted to-be forced outwardly by the camsleeve, means to bind together said base, separators, and

head, and means to rotate said cam sleeve.

22. In a work table, a work holder comrisin .a shaft a base mounted on said shaft, a cam sleeve mounted on said shaft above said base,.a member, adapted to support a stack of gear blanks, mounted on said sleeve above said base, separators mounted on said member around said sleeve, friction bars slidingly arranged on said plate beforced outwardly by the cam sleeve, means to bind together said base, separators, and head, a 'worm-wheelsecured to said cam sleeve, and a worm for said worm-wheel.

23. In awork table, a work holder com prising a shaft, a base mounted on said shaft, a cam sleeve mounted on said shaft above said base, a member, adapted to support a stack of gear blanks, mounted on said sleeve above said base, separators mounted on sa1d member around sa1d sleeve, friction bars slidingly arranged on sa1d plate between said separators, and adapted to be forced outwardly by the cam sleeve, means to bind together said base, separators, and head, a worm-wheel secured tosaid cam sleeeve'withinsaid base, a shaftjoun nale'd in said base, and a worm secured to said last-named shaft and intermeshing with said worm-wheel.

24. The combination, in a work table, with a support, a turn-table mounted on and adapted to be rotated above said support, and revoluble work holders mounted on said turntable, said work holders consisting in part of shafts, of a yoke adapted to fit over the shaft of the work holder which is in operative position, supporting means for saidyoke, means to attach said yoke to and detach it from said last-named workholder, and means to actuate said yoke out of and into engagement with said last-named work holder.

25. The combination, in a work table, with a support, a turn-table mounted on and adapted to be rotated above said support, and revoluble work holders mounted on said turn-table, said work holders consisting in part of shafts, of a yoke adapted to engage the shaft of the work holder which is in operative postion, and to be connected with and disconnected from said holder, supporting and guiding means for the arms ofsaid yoke, one of said arms being provided with a rack, a shaft journaled in said supporting means, a pinion secured to said shaft and intermeshing with said rack, and a crank also secured to said shaft.

26. The combination, in a work table, with a work holder consisting in part of a shaft, and having a head below the upper end of said shaft, a yoke carrying a member which is receivable on said head, interlocking meansbetween said head and member, and means to raise said yoke and member from said head and shaft, and to lower said yoke and member onto said shaft and head, theupper terminal of the shaft being receivable in the yoke.

27. The combination, in a work table, of a work holder consisting in part of a shaft, and having a head, the latter being below the top of said shaft, a yoke, a disk having a sleeve that extends into said yoke and is revoluble therein, interlocking means between said head and disk, and means to raise and lower said yoke.

-.28.The combination, in a work table, 

